Synthesis and structure of new mononuclear octahedral cobalt(III) dioximates derived from isonicotinic hydrazide

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• 作者：Maria Cocu^a ; Ion Bulhac^a ; Eduard Coropceanu^a ; Elena Melnic^b ; Sergiu Shova^a ; ^b ; Olga Ciobanica^a ; Victoria Gutium^a ; Paulina Bourosh^b ; ^{bourosh.xray@phys.asm.md" class="auth_mail}
• 关键词：Cobalt(III) dioximates ; New Schiff base ; Isonicotinic hydrazide ; Crystal structures
• 刊名：Journal of Molecular Structure
• 出版年：24 April, 2014
• 年：2014
• 卷：1063
• 期：Complete
• 页码：274-282
• 全文大小：1090 K

文摘

New organic ligand L (1) resulting from isonicotinic hydrazide and 2,4-pentanedione has been prepared and investigated by physicochemical methods, including elemental analysis, ¹H and ¹³C NMR, IR spectroscopy and X-ray studies.

The X-ray investigation revealed that the condensation of 2,4-pentanedione with isonicotinic hydrazide is accompanied by the formation of a five-membered ring including three carbon atoms of 2,4-pentanedione and two nitrogen atoms of the isonicotinic hydrazide fragment.

The reaction between [Co(DfgH)₂Br(H₂O)] (DfgH₂ = diphenylglyoxime) and L resulted in the formation of the mononuclear octahedral complex [Co(DfgH)₂BrL] (2) with the substitution of the water molecule in the apical position by the ligand L. The reaction starting from [Co(DmgH)₂Cl(H₂O)] (DmgH = dimethylglyoxime) and L resulted in the mononuclear octahedral Co(III) complex with the composition [Co(DmgH)₂ClL鈥瞉 (3), where L鈥?unexpectedly represents a dehydrated derivative of L. The two coordination compounds are characterized by X-ray diffraction method. The IR, ¹H NMR spectral studies of new compounds are also reported.